Finding the Fourth Proportional to 1,393.30, 2,088.42 and 698.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.30 : 2,088.42 = 698.86 : x
2. Step 2: Convert to fraction form
   1,393.30/2,088.42 = 698.86/x
3. Step 3: Cross multiply
   1,393.30x = 2,088.42 × 698.86
4. Step 4: Simplify right side
   1,393.30x = 1,459,513.20
5. Step 5: Solve for x
   x = 1,459,513.20/1,393.30
6. Step 6: Final answer
   x = 1,047.52